A woman with normal vision marries a man with normal vision and gives birth to a colourblind son. Her husband dies and she remarries a colourblind man. What is the probability of her children having the abnormality?
Text Solution
Verified by ExpertsA
Colour blindness is a X-linked recessive disorder. Son gets its X chromosome from the mother, hence the normal mother of a colour blind son will be carrier ( 
). Among the children of a carrier female 
and colour blind man ( 
), 
sons and 
daughters will be affected.
Parent generation : " 
" 
♀︎ ♂︎ | ||
Colourblind girl | Carrier girl | |
Colourblind boy | Normal boy |
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